Spring jack



Feb. 28, 1928. l,660,819

R. C. SCHLORF SPRING JACK Filed Nov. 15. 1926 Patented Feb. as, 1928.

i UNETE RAYMOND o. soHLoRF,

or CHICAGO, ILLINOIS.

SPIRIJSTG} JACK. 1

Application filed November 15, 1926. Serial No. 148.511. 7

My invention relates to spring jacks and has to do more particularly with apparatus of the above character adapted for use as a spring jack to act asa socket for holding audion tubes, but of course not limited to this particular use.

An object of my inventionis to provide a .device of the above character which is s1mple in construction, cheap to manufacture and readily applied. Another feature of my invention is that it may be used in the form of an elongated bar or framehaving the jack springs mounted, along in spaced relation, providing a number of positions so Fig. 1 to show the spring'and terminal ar-' rangement more clearly;

Fig. 4 is an end view of Fig. 3; and Fig. 5 is a top plan view of a section of the jack showing a modified form in which the' guiding recesses are provided in the frame rather than in the jack springsj Referring now more in detail to the form of invention shown in Figs. 1 to 4, I provide a suitable frame A preferably in the form of an elongated rectangular insulating bar having'a plurality of spaced positions each provided with a spring jack for receiving an'applied device such as an audion tube T. These spring jacks are preferably all of the same construction and a. description of one will suflice for all. These jacks include jack springs mounted upon opposite faces as 67 of the frame A and extend to a point adjacent an abutting face 8 adapted to act as a stop for the audiontube or other device applied thereto. These jack springs are spaced so as to provide sufficient clearance between them, and to this end the springs as 9 are vertically disposed and each secured by a suitable terminal screw or binding post 10. The opposite springs 1112 are angularly disposed so as to position the correspondin terminal screws or binding posts 13 suf- 'ficiently away from the post 10 to provide springs are rounded at the terminal received therein and held against proper clearance andinsulation between the partsandtov prevent any inductive flow of current. g

' In order, to properlyreceive the terminals of the tube T when applied to the jack, I

provide recesses adapted to receive the terminals so as to not only guide the tube terminals when applied, but also prevent, any movement of the tube along the barv after its terminals are inserted in. the jack.

Thetube T shown is of the ordinary standardtype having four projecting terminals, Y

thus corresponding, with the four jack springs of each jack. In the form of my invention as shown inFigs. 1 to 4 these recesses are formed at 14 in the ends of the jack springs. In other words, the jack' receiving endsso that the terminals will slide into the recesses. v

In order to revent any rotation of the tube upon the Jack frame I preferably arrange the bar 8 of a thickness so that the terminals will just fit over the bar and slid ingly engage the spring ends when inserted.

Also in order to lighten the bar or frameA and also reduce the losses otherwise occurring across the springs, I- provide'openings vas 15 through the wall thereof, thus providing a support in the nature of a skeleton frame.

It will thus be seen thatI have provided a spring jack in the form of. an elongated member adapted to be secured in any suitable way to the base of the radio receiving set and the wiring readily connected to the various terminals of the. jacks; Also by 'the arrangement provided the tubes are aligned in the receiver, which is usually. a desirable method of mounting them.

In Fig. 5 I have shown a modified method of recessing the elements to' guide the tube terminals,and to this end the recesses are in the form of slots'l t out into the side faces of the frame. The jack springs may then be straight faced as shown in Fig. 5, or recessed as shown in the other form. Vhen constructed with the recesses in the frame A as in Fig. 5, these recesses are so spaced that the tube terminals will be slidingly displacement along the frame. s

What I claim as new-and desire to secure by United States Letters Patent is 1. A spring jack including a rectangular insulating bar, jack springs mounted upon opposite sides of vthe bar with terminal receiving ends adjacent a free edge of the bar, said springs being adapted to fixedly receive extending terminals of an applied device on" opposite sides of the bar between the springs and the sides of the bar.

2. A spring jack including a insulating bar, jack springs mounted upon opposite sides of the bar with terminal receiving ends adjacent-a free edge of the bar, said springs being adapted to fixedly receive extending terminals of an applied dc.- vice on opposite sides of the bar between the springs and the sides of the bar, there being a recess provided for each springend and adjacent face portion of the bar to guidingly receive and hold a received ter niinal against movement along the bar.

3. A spring jack including a rectangular insulating bar, jack springs mounted upon opposite sides of the bar with terminal receiving ends adjacent a free edge of the rectangular bar, said springs being adapted to fixedly recelve extending terminals of anapphed device on opposite sides of the bar between springs and the sldes of the bar, said spring ends being provided each with a recess to receive the applied terminal to prevent movement of the applied device along the bar.

41 A spring jack including a longitudinal rectangular frame having an abutting edge, spaced -four-terminal-audion-tube' receiving positions along the bar jack springs mounted upon opposite sides of the bar at'each position and having tube terminal receiving ends adjacent the abutting edge, whereby RAYMOND C. SCHLORF.

the terminals of an applied tube are insert- 

